package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @author 张旭
 * @version 1.0
 */
@Component
public class RedisIdWorker {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    private static final long BEGIN_TIMESTAMP = 1672531200L;
    private static final int COUNT_BITS = 32;

    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1获取当前日期精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix+":"+date);
        //3.拼接并返回
        return timeStamp<<COUNT_BITS+count;
    }

    public static void main(String[] args) {
        LocalDateTime of = LocalDateTime.of(2023, 1, 1, 0, 0, 0);
        long l = of.toEpochSecond(ZoneOffset.UTC);
        System.out.println(l);//1672531200
    }
}
